Merge "Adds launcher-side support for the SmartSpace shared element transition." into sc-dev am: bdb4ed711c am: b7735b450e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14471950

Change-Id: I264f472a409052b9120e5534cd2b5e44adda15f5